diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/iowait.h')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/iowait.h | 192 |
1 files changed, 134 insertions, 58 deletions
diff --git a/drivers/infiniband/hw/hfi1/iowait.h b/drivers/infiniband/hw/hfi1/iowait.h index 3d9c32c7c340..23a58ac0d47c 100644 --- a/drivers/infiniband/hw/hfi1/iowait.h +++ b/drivers/infiniband/hw/hfi1/iowait.h @@ -1,7 +1,7 @@ #ifndef _HFI1_IOWAIT_H #define _HFI1_IOWAIT_H /* - * Copyright(c) 2015, 2016 Intel Corporation. + * Copyright(c) 2015 - 2018 Intel Corporation. * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. @@ -49,6 +49,7 @@ #include <linux/list.h> #include <linux/workqueue.h> +#include <linux/wait.h> #include <linux/sched.h> #include "sdma_txreq.h" @@ -59,16 +60,47 @@ */ typedef void (*restart_t)(struct work_struct *work); +#define IOWAIT_PENDING_IB 0x0 +#define IOWAIT_PENDING_TID 0x1 + +/* + * A QP can have multiple Send Engines (SEs). + * + * The current use case is for supporting a TID RDMA + * packet build/xmit mechanism independent from verbs. + */ +#define IOWAIT_SES 2 +#define IOWAIT_IB_SE 0 +#define IOWAIT_TID_SE 1 + struct sdma_txreq; struct sdma_engine; /** - * struct iowait - linkage for delayed progress/waiting + * @iowork: the work struct + * @tx_head: list of prebuilt packets + * @iow: the parent iowait structure + * + * This structure is the work item (process) specific + * details associated with the each of the two SEs of the + * QP. + * + * The workstruct and the queued TXs are unique to each + * SE. + */ +struct iowait; +struct iowait_work { + struct work_struct iowork; + struct list_head tx_head; + struct iowait *iow; +}; + +/** * @list: used to add/insert into QP/PQ wait lists - * @lock: uses to record the list head lock * @tx_head: overflow list of sdma_txreq's * @sleep: no space callback * @wakeup: space callback wakeup * @sdma_drained: sdma count drained + * @lock: lock protected head of wait queue * @iowork: workqueue overhead * @wait_dma: wait for sdma_busy == 0 * @wait_pio: wait for pio_busy == 0 @@ -76,6 +108,8 @@ struct sdma_engine; * @count: total number of descriptors in tx_head'ed list * @tx_limit: limit for overflow queuing * @tx_count: number of tx entry's in tx_head'ed list + * @flags: wait flags (one per QP) + * @wait: SE array * * This is to be embedded in user's state structure * (QP or PQ). @@ -98,13 +132,11 @@ struct sdma_engine; * Waiters explicity know that, but the destroy * code that unwaits QPs does not. */ - struct iowait { struct list_head list; - struct list_head tx_head; int (*sleep)( struct sdma_engine *sde, - struct iowait *wait, + struct iowait_work *wait, struct sdma_txreq *tx, uint seq, bool pkts_sent @@ -112,7 +144,6 @@ struct iowait { void (*wakeup)(struct iowait *wait, int reason); void (*sdma_drained)(struct iowait *wait); seqlock_t *lock; - struct work_struct iowork; wait_queue_head_t wait_dma; wait_queue_head_t wait_pio; atomic_t sdma_busy; @@ -121,63 +152,37 @@ struct iowait { u32 tx_limit; u32 tx_count; u8 starved_cnt; + unsigned long flags; + struct iowait_work wait[IOWAIT_SES]; }; #define SDMA_AVAIL_REASON 0 -/** - * iowait_init() - initialize wait structure - * @wait: wait struct to initialize - * @tx_limit: limit for overflow queuing - * @func: restart function for workqueue - * @sleep: sleep function for no space - * @resume: wakeup function for no space - * - * This function initializes the iowait - * structure embedded in the QP or PQ. - * - */ +void iowait_set_flag(struct iowait *wait, u32 flag); +bool iowait_flag_set(struct iowait *wait, u32 flag); +void iowait_clear_flag(struct iowait *wait, u32 flag); -static inline void iowait_init( - struct iowait *wait, - u32 tx_limit, - void (*func)(struct work_struct *work), - int (*sleep)( - struct sdma_engine *sde, - struct iowait *wait, - struct sdma_txreq *tx, - uint seq, - bool pkts_sent), - void (*wakeup)(struct iowait *wait, int reason), - void (*sdma_drained)(struct iowait *wait)) -{ - wait->count = 0; - wait->lock = NULL; - INIT_LIST_HEAD(&wait->list); - INIT_LIST_HEAD(&wait->tx_head); - INIT_WORK(&wait->iowork, func); - init_waitqueue_head(&wait->wait_dma); - init_waitqueue_head(&wait->wait_pio); - atomic_set(&wait->sdma_busy, 0); - atomic_set(&wait->pio_busy, 0); - wait->tx_limit = tx_limit; - wait->sleep = sleep; - wait->wakeup = wakeup; - wait->sdma_drained = sdma_drained; -} +void iowait_init(struct iowait *wait, u32 tx_limit, + void (*func)(struct work_struct *work), + void (*tidfunc)(struct work_struct *work), + int (*sleep)(struct sdma_engine *sde, + struct iowait_work *wait, + struct sdma_txreq *tx, + uint seq, + bool pkts_sent), + void (*wakeup)(struct iowait *wait, int reason), + void (*sdma_drained)(struct iowait *wait)); /** - * iowait_schedule() - initialize wait structure + * iowait_schedule() - schedule the default send engine work * @wait: wait struct to schedule * @wq: workqueue for schedule * @cpu: cpu */ -static inline void iowait_schedule( - struct iowait *wait, - struct workqueue_struct *wq, - int cpu) +static inline bool iowait_schedule(struct iowait *wait, + struct workqueue_struct *wq, int cpu) { - queue_work_on(cpu, wq, &wait->iowork); + return !!queue_work_on(cpu, wq, &wait->wait[IOWAIT_IB_SE].iowork); } /** @@ -228,6 +233,8 @@ static inline void iowait_sdma_add(struct iowait *wait, int count) */ static inline int iowait_sdma_dec(struct iowait *wait) { + if (!wait) + return 0; return atomic_dec_and_test(&wait->sdma_busy); } @@ -267,11 +274,13 @@ static inline void iowait_pio_inc(struct iowait *wait) } /** - * iowait_sdma_dec - note pio complete + * iowait_pio_dec - note pio complete * @wait: iowait structure */ static inline int iowait_pio_dec(struct iowait *wait) { + if (!wait) + return 0; return atomic_dec_and_test(&wait->pio_busy); } @@ -293,9 +302,9 @@ static inline void iowait_drain_wakeup(struct iowait *wait) /** * iowait_get_txhead() - get packet off of iowait list * - * @wait wait struture + * @wait iowait_work struture */ -static inline struct sdma_txreq *iowait_get_txhead(struct iowait *wait) +static inline struct sdma_txreq *iowait_get_txhead(struct iowait_work *wait) { struct sdma_txreq *tx = NULL; @@ -309,6 +318,28 @@ static inline struct sdma_txreq *iowait_get_txhead(struct iowait *wait) return tx; } +static inline u16 iowait_get_desc(struct iowait_work *w) +{ + u16 num_desc = 0; + struct sdma_txreq *tx = NULL; + + if (!list_empty(&w->tx_head)) { + tx = list_first_entry(&w->tx_head, struct sdma_txreq, + list); + num_desc = tx->num_desc; + } + return num_desc; +} + +static inline u32 iowait_get_all_desc(struct iowait *w) +{ + u32 num_desc = 0; + + num_desc = iowait_get_desc(&w->wait[IOWAIT_IB_SE]); + num_desc += iowait_get_desc(&w->wait[IOWAIT_TID_SE]); + return num_desc; +} + /** * iowait_queue - Put the iowait on a wait queue * @pkts_sent: have some packets been sent before queuing? @@ -372,12 +403,57 @@ static inline void iowait_starve_find_max(struct iowait *w, u8 *max, } /** - * iowait_packet_queued() - determine if a packet is already built - * @wait: the wait structure + * iowait_packet_queued() - determine if a packet is queued + * @wait: the iowait_work structure */ -static inline bool iowait_packet_queued(struct iowait *wait) +static inline bool iowait_packet_queued(struct iowait_work *wait) { return !list_empty(&wait->tx_head); } +/** + * inc_wait_count - increment wait counts + * @w: the log work struct + * @n: the count + */ +static inline void iowait_inc_wait_count(struct iowait_work *w, u16 n) +{ + if (!w) + return; + w->iow->tx_count++; + w->iow->count += n; +} + +/** + * iowait_get_tid_work - return iowait_work for tid SE + * @w: the iowait struct + */ +static inline struct iowait_work *iowait_get_tid_work(struct iowait *w) +{ + return &w->wait[IOWAIT_TID_SE]; +} + +/** + * iowait_get_ib_work - return iowait_work for ib SE + * @w: the iowait struct + */ +static inline struct iowait_work *iowait_get_ib_work(struct iowait *w) +{ + return &w->wait[IOWAIT_IB_SE]; +} + +/** + * iowait_ioww_to_iow - return iowait given iowait_work + * @w: the iowait_work struct + */ +static inline struct iowait *iowait_ioww_to_iow(struct iowait_work *w) +{ + if (likely(w)) + return w->iow; + return NULL; +} + +void iowait_cancel_work(struct iowait *w); +int iowait_set_work_flag(struct iowait_work *w); + #endif |
